using System;
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using UIKit;
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using Shared.IO;
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using CoreGraphics;
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using Foundation;
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namespace Shared
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{
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/// <summary>
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/// 位置布局
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/// </summary>
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public class HorizontalPages : ViewGroup
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{
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readonly MyHorizontalPages iosUIScrolView;
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//readonly UIPageControl iosUIPageControl;
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/// <summary>
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/// 页面变化事件
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/// </summary>
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public Action<HorizontalPages,int> PageChange;
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/// <summary>
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/// 垂直方向滚动视图
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/// </summary>
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class MyHorizontalPages : UIScrollView
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{
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[Weak] HorizontalPages HorizontalPages;
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//nfloat mLastX, mLastY, deltaX;
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public MyHorizontalPages(HorizontalPages HorizontalPages)
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{
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this.HorizontalPages = HorizontalPages;
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//this.ScrollEnabled = false;
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DecelerationStarted += (s, e) =>
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{
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var tempUIScrolView = s as MyHorizontalPages;
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//获取当前界面的索引
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//System.Console.WriteLine($"DecelerationStarted-------{tempUIScrolView.ContentOffset.X}");
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var tempPageIndex = Convert.ToInt32(tempUIScrolView.ContentOffset.X / (tempUIScrolView.Frame.Width - 2 * this.HorizontalPages._RowPadding + this.HorizontalPages._PagePadding));
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this.HorizontalPages.PageIndex = tempPageIndex;
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};
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DraggingEnded += (s, e) =>
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{
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var tempUIScrolView = s as MyHorizontalPages;
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if (!e.Decelerate)
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{
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//System.Console.WriteLine($"DraggingEnded-------{tempUIScrolView.ContentOffset.X}");
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var tempPageIndex = Convert.ToInt32(tempUIScrolView.ContentOffset.X / (tempUIScrolView.Frame.Width - 2 * this.HorizontalPages._RowPadding + this.HorizontalPages._PagePadding));
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this.HorizontalPages.PageIndex = tempPageIndex;
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}
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};
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}
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/// <summary>
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/// 点击开始
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesBegan(NSSet touches, UIEvent evt)
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{
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HorizontalPages?.TouchEvent(EventActions.Down, (touches.AnyObject as UITouch).LocationInView(this));
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//CGPoint point = (touches.AnyObject as UITouch).LocationInView(this);
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////记录点击的最新X坐标
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//mLastX = point.X;
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//bMove = false;
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//System.Console.WriteLine($"TouchesBegan-------{mLastX}");
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}
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int mTouchSlop = 20;
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bool bMove;
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/// <summary>
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/// 移动
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesMoved(NSSet touches, UIEvent evt)
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{
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HorizontalPages?.TouchEvent(EventActions.Move, (touches.AnyObject as UITouch).LocationInView(this));
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//CGPoint point = (touches.AnyObject as UITouch).LocationInView(this);
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//deltaX = point.X - mLastX;
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//if (Math.Abs(deltaX) >= mTouchSlop) {
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// bMove = true;
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//}
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//System.Console.WriteLine($"deltaX-------{deltaX}");
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}
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/// <summary>
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/// 点击弹起
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesEnded(NSSet touches, UIEvent evt)
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{
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HorizontalPages?.TouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
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//if (bMove)
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//{
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// if (deltaX < 0)//左滑
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// {
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// this.HorizontalPages.PageIndex--;
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// }
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// else
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// {
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// this.HorizontalPages.PageIndex++;
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// }
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//}
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}
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public override void TouchesCancelled(NSSet touches, UIEvent evt)
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{
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HorizontalPages?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
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}
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/// <summary>
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/// 框架默认加了两个UIImageView ，这样可以去掉默认添加
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/// </summary>
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/// <param name="view">View.</param>
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public override void AddSubview(UIView view)
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{
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if (view.GetType() == typeof(UIImageView) && view.Tag != int.MinValue)
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{
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return;
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}
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if (view.ToString().Contains("UIScrollViewScrollIndicator"))
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{
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return;
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}
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base.AddSubview(view);
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}
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}
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/// <summary>
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/// 构造函数
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/// </summary>
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public HorizontalPages()
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{
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viewGroup = new UIView();
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iosUIScrolView = new MyHorizontalPages(this) { };
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realViewGroup = iosUIScrolView;
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//启动翻页功能
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//iosUIScrolView.PagingEnabled = true;
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iosUIScrolView.ShowsHorizontalScrollIndicator = false;
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viewGroup.AddSubview(iosUIScrolView);
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_PagePadding = Application.GetRealWidth(50);
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_RowPadding = Application.GetRealWidth(100);
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}
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//两个Page之间的距离
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int _PagePadding;
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public int PagePadding
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{
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get
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{
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return _PagePadding;
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}
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set
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{
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_PagePadding = value;
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ReLocation();
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}
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}
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//page的外边距
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int _RowPadding;
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public int RowPadding
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{
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get
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{
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return _RowPadding;
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}
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set
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{
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_RowPadding = value;
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ReLocation();
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}
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}
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/// <summary>
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/// 是否允许滑动
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/// </summary>
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/// <value><c>true</c> if scroll enabled; otherwise, <c>false</c>.</value>
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public bool ScrollEnabled
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{
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get
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{
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return (iosUIScrolView as MyHorizontalPages).ScrollEnabled;
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}
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set
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{
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(iosUIScrolView as MyHorizontalPages).ScrollEnabled = value;
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}
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}
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int pageIndex;
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/// <summary>
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/// 设置或者获取当前的界面索引
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/// </summary>
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/// <value>The index of the page.</value>
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public int PageIndex
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{
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get
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{
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return pageIndex;
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}
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set
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{
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if (value < 0 || ChildrenCount <= value)
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{
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return;
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}
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int beforePageIndex = pageIndex;
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pageIndex = value;
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if (!IsCanRefresh)
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{
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return;
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}
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var viewSize = iosUIScrolView.Frame.Size;
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var rect = new CGRect(pageIndex * viewSize.Width, 0, viewSize.Width, viewSize.Height);
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if (pageIndex != 0) {
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var frame = iosUIScrolView.Subviews[pageIndex].Frame;
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var w = frame.X - _RowPadding;
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rect = new CGRect(w, 0, viewSize.Width, viewSize.Height);
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//System.Console.WriteLine($"CGRect xx-------{w}");
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}
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//System.Console.WriteLine($"pageIndex xx-------{pageIndex}");
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iosUIScrolView.ScrollRectToVisible(rect, false);
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if (beforePageIndex != pageIndex)
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{
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PageChange?.Invoke(this, pageIndex);
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}
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}
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}
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/// <summary>
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/// 增加子控件
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/// </summary>
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/// <param name="view">View.</param>
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public override void AddChidren(View view)
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{
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//var v = Application.AverageScale;
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//var vv = Application.CurrentHeight;
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//var dddd = Application.DesignWidth;
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base.AddChidren(view);
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ReLocation();
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}
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/// <summary>
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/// 重新排位置及设备内容大小
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/// </summary>
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public virtual void ReLocation()
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{
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if (iosUIScrolView.Subviews.Length == 0)
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{
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return;
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}
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var frame0 = iosUIScrolView.Subviews[0].Frame;
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frame0.X = _RowPadding;
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iosUIScrolView.Subviews[0].Frame = frame0;
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for (int i = 1; i < iosUIScrolView.Subviews.Length; i++)
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{
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var frame = iosUIScrolView.Subviews[i].Frame;
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frame.X = iosUIScrolView.Subviews[i - 1].Frame.Right+_PagePadding;
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iosUIScrolView.Subviews[i].Frame = frame;
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}
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iosUIScrolView.ContentSize = new CoreGraphics.CGSize(iosUIScrolView.Subviews[iosUIScrolView.Subviews.Length - 1].Frame.Right+_RowPadding, iosUIScrolView.Frame.Height);
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}
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/// <summary>
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/// 控件宽度
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/// </summary>
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/// <value>The width.</value>
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public override int Width
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{
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get
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{
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return base.Width;
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}
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set
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{
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base.Width = value;
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if (!IsCanRefresh)
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return;
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}
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}
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/// <summary>
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/// 控件的高度
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/// </summary>
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/// <value>The height.</value>
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public override int Height
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{
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get
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{
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return base.Height;
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}
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set
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{
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base.Height = value;
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if (!IsCanRefresh)
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return;
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}
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}
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/// <summary>
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/// 移除当前控件
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/// </summary>
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/// <param name="view">View.</param>
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internal override void Remove(View view)
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{
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base.Remove(view);
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ReLocation();
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if (PageIndex > ChildrenCount - 1)
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{
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PageIndex = ChildrenCount - 1;
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}
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}
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/// <summary>
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/// 移除所有的控件
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/// </summary>
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public override void RemoveAll()
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{
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base.RemoveAll();
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ReLocation();
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PageIndex = 0;
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}
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/// <summary>
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/// 根据索引移除控件
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/// </summary>
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/// <param name="index">Index.</param>
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public override void RemoveAt(int index)
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{
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if (viewList.Count - 1 < index || index < 0)
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{
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return;
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}
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Remove(viewList[index]);
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}
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}
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}
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